.cenav {
  height: 726px;
  overflow: hidden;
}
.cenav div {
  position: relative;
  top: 0px;
  transition: 1s;
}
.cenav img {
  height: 236.66666667 px;
  width: 100%;
}
.cenav .btn {
  position: absolute;
  height: 30px;
  background: pink;
  display: block;
  width: 100%;
  text-align: center;
  line-height: 30px;
}
.cenav .top {
  top: 0px;
}
.cenav .bottom {
  bottom: 0px;
}
